Statistics

Williston Basin

	2010	2009	2008	2007	2006
Average Production
Oil and liquids (bbl/d)	2,877	2,807	2,754	2,946	3,117
Natural gas (mmcf/d)	0.64	0.54	0.47	0.28	0.22
Equivalents (boe/d)	2,984	2,897	2,833	2,993	3,152
Total Proved and Probable Reserves⁽¹⁾
Oil and liquids (mbbl)	11,339	12,508	12,494	12,829	13,452
Natural gas (bcf)	1.32	2.28	2.31	2.59	2.45
Equivalents (mboe)	11,558	12,889	12,878	13,262	13,861
Undeveloped Lands
Net acres (thousands)	45.4	60.7	62.9	68.7	58.6
Drilling Activities
Net wells	17.7	9.6	7.4	8.6	22.0
Core Area Cash Flows ($ millions)⁽²⁾	48.72	35.83	58.05	41.57	42.55
Capital Expenditures ($ millions)
Net property and corporate acquisitions/(dispositions)	(16.97)	0.20	0.12	0.47	(3.14)
Total field capital expenditures	29.23	19.48	13.70	16.59	25.27
Total expenditures	12.26	19.68	13.82	17.06	22.13
Proved and probable reserves are Zargon working interest reserves before royalties (6:1). The term “core area cash flows” is defined as petroleum and natural gas revenue for a core area, net of royalties and production expenses.